The average price of a college math textbook is $179 and the standard deviation is $25. Suppose that 10 textbooks are randomly chosen. Round all answers to 4 decimal places where possible.

σₓ² = 7.9056

Step-by-step explanation:

Recall from the example given,

The average price of a math textbook =$179

The standard deviation =$25

The mean= 179

Standard deviation = 25

n =number of textbook randomly chosen which is 10

n=10

Then

Mean µ = 161

σ = 25

σₓ = σₓ/√n

= 25/√10

Therefore. σₓ² = 7.9056

the inequality is:

250c+180g≥950

step-by-step explanation:

let c denotes the number of days in a week   miyoko worked as a cryptographer.

and g denotes the number of days in a week she works as a geologist.

now we are given that she earns $250 for every day she works as a cryptographer,and earns $180 for every day she works as a geologist.

now miyoko's goal is to earn more than $950 this week.

hence, the inequality could be represented as:

250c+180g≥950